1 /* $OpenBSD: diskmap.c,v 1.16 2017/09/08 05:36:52 deraadt Exp $ */ 2 3 /* 4 * Copyright (c) 2009, 2010 Joel Sing <jsing@openbsd.org> 5 * 6 * Permission to use, copy, modify, and distribute this software for any 7 * purpose with or without fee is hereby granted, provided that the above 8 * copyright notice and this permission notice appear in all copies. 9 * 10 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES 11 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 12 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR 13 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 14 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 15 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF 16 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 17 */ 18 19 /* 20 * Disk mapper. 21 */ 22 23 #include <sys/param.h> 24 #include <sys/systm.h> 25 #include <sys/device.h> 26 #include <sys/errno.h> 27 #include <sys/conf.h> 28 #include <sys/dkio.h> 29 #include <sys/disk.h> 30 #include <sys/disklabel.h> 31 #include <sys/file.h> 32 #include <sys/filedesc.h> 33 #include <sys/lock.h> 34 #include <sys/malloc.h> 35 #include <sys/namei.h> 36 #include <sys/proc.h> 37 #include <sys/vnode.h> 38 #include <sys/pledge.h> 39 #include <sys/namei.h> 40 41 int 42 diskmapopen(dev_t dev, int flag, int fmt, struct proc *p) 43 { 44 return 0; 45 } 46 47 int 48 diskmapclose(dev_t dev, int flag, int fmt, struct proc *p) 49 { 50 return 0; 51 } 52 53 int 54 diskmapioctl(dev_t dev, u_long cmd, caddr_t addr, int flag, struct proc *p) 55 { 56 struct dk_diskmap *dm; 57 struct nameidata ndp; 58 struct filedesc *fdp; 59 struct file *fp = NULL; 60 struct vnode *vp = NULL, *ovp; 61 char *devname; 62 int fd, error = EINVAL; 63 64 if (cmd != DIOCMAP) 65 return EINVAL; 66 67 /* 68 * Map a request for a disk to the correct device. We should be 69 * supplied with either a diskname or a disklabel UID. 70 */ 71 72 dm = (struct dk_diskmap *)addr; 73 fd = dm->fd; 74 devname = malloc(PATH_MAX, M_DEVBUF, M_WAITOK); 75 if (copyinstr(dm->device, devname, PATH_MAX, NULL)) 76 goto invalid; 77 if (disk_map(devname, devname, PATH_MAX, dm->flags) == 0) 78 if (copyoutstr(devname, dm->device, PATH_MAX, NULL)) 79 goto invalid; 80 81 /* Attempt to open actual device. */ 82 if ((error = getvnode(p, fd, &fp)) != 0) 83 goto invalid; 84 85 fdp = p->p_fd; 86 fdplock(fdp); 87 88 NDINIT(&ndp, 0, 0, UIO_SYSSPACE, devname, p); 89 ndp.ni_pledge = PLEDGE_RPATH; 90 if ((error = vn_open(&ndp, fp->f_flag, 0)) != 0) 91 goto bad; 92 93 vp = ndp.ni_vp; 94 95 /* Close the original vnode. */ 96 ovp = (struct vnode *)fp->f_data; 97 if (fp->f_flag & FWRITE) 98 ovp->v_writecount--; 99 100 if (ovp->v_writecount == 0) { 101 vn_lock(ovp, LK_EXCLUSIVE | LK_RETRY, p); 102 VOP_CLOSE(ovp, fp->f_flag, p->p_ucred, p); 103 vput(ovp); 104 } 105 106 fp->f_type = DTYPE_VNODE; 107 fp->f_ops = &vnops; 108 fp->f_data = (caddr_t)vp; 109 fp->f_offset = 0; 110 fp->f_rxfer = 0; 111 fp->f_wxfer = 0; 112 fp->f_seek = 0; 113 fp->f_rbytes = 0; 114 fp->f_wbytes = 0; 115 116 VOP_UNLOCK(vp, p); 117 118 FRELE(fp, p); 119 fdpunlock(fdp); 120 free(devname, M_DEVBUF, PATH_MAX); 121 122 return 0; 123 124 bad: 125 if (vp) 126 vput(vp); 127 if (fp) 128 FRELE(fp, p); 129 130 fdpunlock(fdp); 131 132 invalid: 133 free(devname, M_DEVBUF, PATH_MAX); 134 135 return (error); 136 } 137 138 int 139 diskmapread(dev_t dev, struct uio *uio, int flag) 140 { 141 return ENXIO; 142 } 143 144 int 145 diskmapwrite(dev_t dev, struct uio *uio, int flag) 146 { 147 return ENXIO; 148 } 149